Not much better on Android, I actually taught myself braille just trying out the braille keyboard last morth and have just switch to that for typing as it is faster and more reliable.

It’s interesting, that so many people seem to have problems with voice dictation. For me, it actually works great. In fact, I am using voice dictation right now.
I actually wish, voice dictation would work on a multi-lingual basis. my first language is German. So, I always have to switch keyboards, depending on which language I want to use for dictation.
Are you using the actual voice dictation, or do you use Siri? Because, in my experience, that makes a huge difference. Siri kind of sucks, when it comes to dictation.

Same here.

When I use it on distopea it adds a strange character at the end of each sentence or new word.

I try to pretend I am slow when speaking. Your not alone in this

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Short Answer: Software Patents. Until key patents expire, no one provider will have all the pieces of the puzzle to make good stuff.